str1 = 'aa'
str2 = 'bb'

list1 = [1, 2]
list2 = [10, 20]

t1 = (1, 2)
t2 = (10, 20)

dict1 = {'name': 'Python'}
dict2 = {'age': 30}

# 运算符+      合并      支持类型：字符串、列表、元组
print(str1 + str2)
print(list1 + list2)
print(t1 + t2)

# error: print(dict1 + dict2)   字典不支持合并运算
